8.39. Choose the incorrect statement.

(a) A redox couple consists of oxidised and reduced form of the same substance taking part in the oxidation or reduction half reaction.

(b) Oxidation involves gain of one or more electrons by a species during a reaction.

(c) Half reactions that involve loss of electrons are called oxidation reactions.

(d) Half reactions that involve gain of electrons are called reduction reactions.

How many of these compounds will undergo disproportionation on hydrolysis? CO?, NO?, Cl?, F?, ClO?, Cl?O?, N?O?, SO?, P?O??

40. Best reducing agent is:
(a) He              (b) Be           (c) Li            (d) Al

37. Which element is considered to have oxidation number of +3 in all its compounds?

(a) Be              (b) Li             (c) Al         (d) Sc

36. Oxidation number ofS in S₂O₈^-2 is

(a) -2           (b) -6           (c) +2          (d) +6

32. Assertion: Na⁺ ion has an oxidation number of +1, Mg²⁺ ion, +2, Fe³⁺ ion, +3, Cl^– ion, –1, O^2– ion, –2; and so on.

Reason: For ions composed of only one atom, the oxidation number is equal to the charge on the ion.